EP1140237B1 - Bioaktive implantate und verfahren zu deren herstellung - Google Patents
Bioaktive implantate und verfahren zu deren herstellung Download PDFInfo
- Publication number
- EP1140237B1 EP1140237B1 EP99965491A EP99965491A EP1140237B1 EP 1140237 B1 EP1140237 B1 EP 1140237B1 EP 99965491 A EP99965491 A EP 99965491A EP 99965491 A EP99965491 A EP 99965491A EP 1140237 B1 EP1140237 B1 EP 1140237B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- implant
- ceramic
- glass
- lye
- implants
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/02—Inorganic materials
- A61L27/10—Ceramics or glasses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/02—Inorganic materials
- A61L27/10—Ceramics or glasses
- A61L27/105—Ceramics or glasses containing Al2O3
Definitions
- the invention relates to bioactive implants and methods for producing implants for use in the human or animal body and in particular Implants made at least in part of ceramic, glass or glass ceramic exist, made in the shape to be used later.
- Implants known and used in medical technology are found in particular in Form of prostheses or bone substitute materials in orthopedic and dental prosthetics Application area.
- Metals and plastics are used here as well as inorganic non-metallic materials (glass, ceramics and binders) as well as composite materials from the aforementioned material groups.
- the most popular An example of bioceramics is the hip joint ball made of aluminum oxide ceramic.
- Such implants are made from aluminum oxide powder powder metallurgical route established. The synthetic raw material is processed isostatically pressed, in the "green” or "white”, d. H. in pressed or pre-fired, Condition processed, then sintered, hot isostatically sintered and finally grinding and polishing hard-worked.
- prostheses made of pure hard ceramics show the best abrasion behavior, especially when used as joint prostheses, for example for artificial hip joints, is of great importance.
- prostheses made of pure aluminum oxide have not become established in practice because the early loosening rate is very high. This is due to, that alumina ceramic is bioinert, d. H. that an active ingrowth or growth of the body tissue to the implant does not take place, but that it becomes Formation of a connective tissue intermediate layer comes. Especially in zones in which have special loads on the implant on the surrounding tissue, this leads to a regular withdrawal of the body tissue, so that the stress peaks relocate to other areas, where the withdrawal of the Tissue takes place.
- Bioactive materials such as hydroxyapatite or tricalcium phosphate, show one good bone ingrowth / growth, but are not load-stable and suitable therefore not for prosthetics and only to a limited extent as a bone substitute.
- Implants and related manufacturing processes are state of the art known from the material combinations metal-polyethylene, metal-metal or ceramic-ceramic exist. Ceramic-ceramic combinations show this by far the best abrasion resistance. Because of the bio-inertness of the previously used Ceramics made of aluminum oxide and the resulting high Early loosening rates do not use pure aluminum oxide ceramics. It however, implants and related manufacturing processes are known which made of a combination of ceramic for the sliding surface and metal alloys for the tissue contact exist.
- titanium and cobalt-chromium-molybdenum alloys come as metals into consideration. From a material technology perspective Such a combination of materials has the advantage that, particularly with mechanical highly stressed prostheses of the main body of the implant with bone contact made of a tough metal and the part performing the joint function (ball or pan) can consist of a particularly abrasion-resistant hard ceramic.
- the ceramic Components can e.g. B. plugged onto the metallic base body become.
- the metals or metal alloys used are bioinert shelf life can be achieved with the implants described above from about 10 to 15 years old. At the latest, however, these implants are also available the loosening process has progressed so far that the functionality for example, a hip prosthesis is acutely at risk.
- a comparable one Loosening behavior also shows customary implants in the prior art that are made purely of metal. These point in addition to the still unsatisfactory Durability also has less favorable abrasion behavior than implants made of hard ceramics.
- the invention has for its object to provide implants that on the one hand are mechanically highly resilient and have a favorable abrasion behavior, on the other hand by good growth behavior with regard to body tissue distinguish themselves and in particular in a simple and inexpensive manner can also be made for use in prostheses.
- the goal is the provision bioactive, mechanically heavy-duty implants and implant materials.
- the invention accordingly relates to an implant that is made at least in part Ceramics, glass or glass ceramics in a shape to be used later exist for the human or animal body and at least on part of its ceramic, Glass and / or glass ceramic surface made of oxide compounds close to the surface the ceramic, the glass or the glass ceramic formed by implementation Has hydroxide compounds.
- these oxide ceramic implants at least on part of the ceramic, glass or glass ceramic surface at least some of the oxide compounds are converted to hydroxide compounds. This leads to an increased adherence rate and proliferation of cells, e.g. B. Osteoblasts, on the surface of an implant manufactured in this way.
- B. Osteoblasts e.g. Osteoblasts
- such an implant is unique even when used of ceramics, glass or glass ceramics, d. H. of all bio-inert materials, due to the hydroxide compounds generated on its surface through increased primary adhesion of target cells (especially osteoblasts) out.
- target cells especially osteoblasts
- the hydroxide compounds already are formed on a surface having a shape as for the later Use of the implant is provided. Due to differences in density and the nature of the hydroxy compounds pre-formed on the surface Implants of different bioactivity for use in human and animal body available.
- the invention thus makes implants accessible to a wide range of bioactivity.
- the implants according to the invention can biocompatible substances coupled to the modified surfaces are wearing.
- the invention further relates to a method for producing an implant, which is at least partially made of ceramics, glass or glass ceramics for which Use in the human or animal body, at least part of the Surface of the implant, which has ceramic, glass or glass ceramic, a lye is exposed. It is advantageous to have at least some of these treated with lye Oxide ceramics in the shape to be used later.
- pure ceramic implants can be made Realize good bioactive behavior with high permanent load stability and thus show good implant contact.
- the alkali used and the exposure temperature and duration can be a achieve different levels of "bioactivation".
- the process according to the Invention is not a new layer of foreign material, as in the known Plasma hydroxyapatite coating applied, but rather it will be by a reaction near surface oxide compounds of glass, ceramic or Glass ceramic-containing implant converted to hydroxide compounds.
- the Layer thickness by an at least partial conversion of the surface of the Activated layer obtained from the substrate, firmly anchored to the substrate, is extreme thin and for the achievement of the goal, namely the improvement of the growth behavior, completely adequate.
- the risk of a coating flaking off with Basic body, d. H. deviating from the ceramic, the glass or the glass ceramic Material properties do not exist.
- the alkali and / or the surfaces of the implant to be treated during treatment Has temperature above 50 ° C, preferably between 80 ° C and 120 ° C. In this way the exposure time can be compared to lower alkali temperatures be shortened.
- An accelerated formation of the hydroxide compounds can also be achieved by the alkali treatment under an increased compared to the atmospheric pressure Printing takes place.
- the method according to the invention can be carried out particularly easily if the implant is at least partially immersed in a bath of the alkali.
- the implant is made of aluminum oxide ceramic and the lye is a 30% sodium hydroxide solution is.
- bases such as e.g. B. caustic soda and others strong, e.g. B. inorganic bases, also used in high aqueous concentrations become.
- An advantageous embodiment is that surface areas of the implant and / or the lye in the vicinity of the surface areas of the implant to be treated be heated locally.
- implants can - starting from a treatment with an otherwise comparatively cold Lye - can be realized with bioactivity of varying local strength.
- the implant is particularly useful if the growth behavior is certain Areas should be particularly promoted while other areas where possible should remain bioinert.
- a particularly precise dosage and spatial distribution of the hydroxylated Surface areas can be realized when the treatment with lye is complete pulsed laser radiation is supported.
- bioactive Substances can be whole proteins, e.g. B. fibronectin, or Peptide sequences, e.g. B. RGD binding sequence, or active groups osteoinductive Fabrics, e.g. B. BMP act.
- materials to be coupled for example Calcium phosphates or special substances in question.
- the implant according to the invention is simple and inexpensive than manufacture the implants according to the prior art. Compared to composite implants or material combinations, such as hard ceramic and metal or with hydroxyapatite coated implants, the manufacturing costs are even much lower. For example, very good results can be achieved if the implant is made of aluminum oxide ceramic and treated with sodium hydroxide solution is.
- a defoamer is used before spray drying added, the proportion by weight is 0.05%. Then use suitable A green compact of the respective implant is produced.
- the one spent Press pressure is about 100 MPa.
- the subsequent ceramic fire takes place in an exhausted kiln. Debinding of organic additives The actual ceramic fire takes place at 500 ° C for about 2 hours at approx. 1600 ° C also for 2 hours.
- the temperature gradient, starting from room temperature to debinding temperature, from debinding temperature to the sintering temperature and from the sintering temperature back to room temperature is between 2 and 3 K / min.
- the sintered implants can be directly in without further surface treatment a flask are placed in which the sodium hydroxide solution used for the treatment located.
- the piston used is made of corrosion protection reasons Polytetrafluoroethylene (PTFE) or polytetrafluoroacrylate (PTFA) plastic.
- the 30% sodium hydroxide solution (30% by weight) used is placed on a with the help of a heating element Heated between 90 and 110 ° C. With the help of a reflux condenser continuous operation of the device due to recovery of the achieved liquid medium.
- the Alkaline treatment of the selected implant surface at atmospheric pressure for a period of between 12 and 96 hours.
- Fig. 1 shows can be by means of small-angle X-ray diffraction on the implant surfaces observe a conversion of aluminum oxide to aluminum hydroxides.
- the mineral phases known as diasphor and boehmite occur, their Hydroxyl groups are responsible for the bioactive material behavior.
- FIGS. 2 and 3 A comparison of the different growth behavior of an implant made of untreated pure aluminum oxide ceramic and an implant according to the invention, the surface of which has been treated with sodium hydroxide solution, is possible on the basis of FIGS. 2 and 3, in which the magnification is 40 times.
- adhered osteoblasts on the ceramic can be recognized by the alkaline phosphatase staining (dark).
- Individual cells are stained in FIG. 2 (conventional Al 2 O 3 ceramic).
- Fig. 3 implant according to the invention with a bioactive surface
- the number of cells of AP-positive cells is increased and so-called “clusters" (AP-positive cell clusters), later mineralization centers, form as evidence of advanced cell differentiation. This proves the very high bioactivity of the implant according to the invention.
- Human osteoblasts were removed from removed femoral heads using the explant technique. For this purpose, the bone was crushed and placed in 1 mm 3 pieces in petri dishes. The cultivation takes place in Dulbecco's DMEM medium with the addition of 10% calf serum and 1% penicillin / streptomycin. After three weeks, the confluent adult cells were passaged, after another two weeks and again passaging, 4 ⁇ 10 4 cells were sown on test specimens (22 mm in diameter). Adhesion after 24 hours, cytotoxicity and protein secretion / mineralization after 7 days were checked.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Ceramic Engineering (AREA)
- Transplantation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dermatology (AREA)
- Medicinal Chemistry (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Engineering & Computer Science (AREA)
- Epidemiology (AREA)
- Inorganic Chemistry (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Materials For Medical Uses (AREA)
- Prostheses (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Description
- Fig. 1
- ein Phasendiagramm der Oberflächenbereiche eines erfindungsgemäßen aktivierten Aluminiumoxid-Implantats, aufgenommen mittels Kleinwinkelröntgenbeugung;
- Fig. 2
- die durch AP-Färbung sichtbar gemachten Zielzellen an der Oberfläche eines Implantats nach dem Stand der Technik;
- Fig. 3
- wie Fig. 2, jedoch bei einem erfindungsgemäßen Implantat, dessen Oberfläche zuvor einer Lauge ausgesetzt wurde;
- Fig. 4
- ein Balkendiagramm mit der Abhängigkeit der Zellzahl von der Aktivierungsdauer;
- Fig. 5
- ein Balkendiagramm mit der Abhängigkeit der Adhäsion von der Aktivierungsdauer; und
- Fig. 6
- ein Balkendiagramm mit der Abhängigkeit der Phosphatase-Sekretion von der Aktivierungsdauer.
Claims (10)
- Implantat, das zumindest zum Teil aus Keramik, Glas oder Glaskeramik besteht, für den menschlichen oder tierischen Körper, dadurch gekennzeichnet, daß das Implantat zumindest an einem Teil der Keramik-, Glas- oder Glaskeramik-Oberfläche aus Oxidverbindungen gebildete Hydroxidverbindungen aufweist.
- Implantat gemäß Patentanspruch 1, gekennzeichnet durch Aluminiumoxid und, an der Oberfläche, durch aus Aluminiumoxid gebildeten Hydroxidverbindungen.
- Implantat gemäß Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß an die Oberflächen-Hydroxidverbindungen biokompatible Substanzen angekoppelt sind.
- Verfahren zur Herstellung eines Implantats für die Verwendung im menschlichen oder tierischen Körper, wobei das Implantat zumindest zum Teil aus Keramik, Glas oder Glaskeramik besteht, insbesondere gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß zumindest ein Teil der Keramik, Glas oder Glaskeramik aufweisenden Oberfläche des Implantats einer Lauge ausgesetzt wird.
- Verfahren nach Patentanspruch 4, dadurch gekennzeichnet, daß die Temperatur der Lauge und/oder der zu behandelnden Implantat-Oberflächen größer als 50°C ist, vorzugsweise eine Temperatur von 80°C bis 120°C aufweist.
- Verfahren nach einem der Patentansprüche 4 oder 5, dadurch gekennzeichnet, daß die Laugenbehandlung unter einem gegenüber Atmosphärendruck erhöhten Druck erfolgt.
- Verfahren nach einem der Patentansprüche 4 bis 6, dadurch gekennzeichnet, daß das Implantat zumindest teilweise in ein Bad der Lauge getaucht wind.
- Verfahren nach einem der Patentansprüche 4 bis 7, dadurch gekennzeichnet, daß das Implantat aus Aluminiumoxid-Keramik besteht und die Lauge 30 %-ige Natronlauge ist.
- Verfahren nach einem der Patentansprüche 4 bis 8, dadurch gekennzeichnet, daß zu behandelnde Oberflächenbereiche des Implantats und/oder die Lauge in der Nähe zu behandelnder Oberflächenbereiche des Implantats lokal erhitzt werden, vorzugsweise mittels gepulster Laserstrahlung.
- Verfahren nach einem der Patentansprüche 4 bis 9, dadurch gekennzeichnet, daß zumindest an Teilbereiche der zuvor einer Lauge ausgesetzten Oberflächenbereiche des Implantats spezielle biokompatible Substanzen angekoppelt werden.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19858501A DE19858501A1 (de) | 1998-12-18 | 1998-12-18 | Verfahren zur Herstellung eines Implantats |
DE19858501 | 1998-12-18 | ||
PCT/EP1999/010091 WO2000037121A1 (de) | 1998-12-18 | 1999-12-17 | Bioaktive implantate und verfahren zu deren herstellung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1140237A1 EP1140237A1 (de) | 2001-10-10 |
EP1140237B1 true EP1140237B1 (de) | 2002-08-07 |
Family
ID=7891576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99965491A Expired - Lifetime EP1140237B1 (de) | 1998-12-18 | 1999-12-17 | Bioaktive implantate und verfahren zu deren herstellung |
Country Status (12)
Country | Link |
---|---|
US (1) | US6818332B1 (de) |
EP (1) | EP1140237B1 (de) |
JP (1) | JP2002532202A (de) |
KR (1) | KR100667619B1 (de) |
AT (1) | ATE221790T1 (de) |
AU (1) | AU757451B2 (de) |
CA (1) | CA2355593C (de) |
DE (2) | DE19858501A1 (de) |
DK (1) | DK1140237T3 (de) |
ES (1) | ES2178499T3 (de) |
PT (1) | PT1140237E (de) |
WO (1) | WO2000037121A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10115818A1 (de) * | 2001-03-26 | 2002-10-10 | Wieland Dental & Technik Gmbh | Verwendung keramischer Schlicker zur Herstellung vollkeramischer Dentalformteile |
WO2006105161A2 (en) * | 2005-03-30 | 2006-10-05 | Cartilix, Inc. | Coated medical device |
DE102006037067B4 (de) * | 2006-08-08 | 2011-06-16 | Metoxit Ag | Verfahren zum Herstellen eines Implantats mit einer porösen, keramischen Oberflächenschicht |
WO2009079805A1 (de) * | 2007-12-20 | 2009-07-02 | Thommen Medical Ag | Implantat und verfahren zu dessen herstellung insbesondere dessen oberflächenmodifikation |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4171544A (en) * | 1978-04-05 | 1979-10-23 | Board Of Regents, For And On Behalf Of The University Of Florida | Bonding of bone to materials presenting a high specific area, porous, silica-rich surface |
DE3241589A1 (de) * | 1982-11-10 | 1984-05-17 | Pfaudler-Werke Ag, 6830 Schwetzingen | Implantate und verfahren zu deren herstellung |
JPS61201683A (ja) * | 1985-03-06 | 1986-09-06 | オリンパス光学工業株式会社 | 人工骨用複合材料 |
JPH0251481A (ja) * | 1988-02-01 | 1990-02-21 | Asahi Optical Co Ltd | 多孔質アパタイト焼結体の製法 |
DE3914999C1 (de) * | 1989-05-08 | 1990-09-13 | Battelle-Institut Ev, 6000 Frankfurt, De | |
DE4032570A1 (de) | 1990-10-13 | 1992-04-16 | Therm Aix Ges Fuer Tech Kerami | Verfahren zum herstellen von implantaten |
EP0672117A4 (de) * | 1992-08-13 | 1996-06-12 | Univ Pennsylvania | Bioaktive materialien zur in vitro inokkulation von zellen - nützlich als implantierbarer knochenersatz. |
US6121172A (en) * | 1993-11-15 | 2000-09-19 | The Trustees Of The University Of Pennsylvania | Composite materials using bone bioactive glass and ceramic fibers |
JPH08182755A (ja) * | 1994-12-29 | 1996-07-16 | Ishikawajima Harima Heavy Ind Co Ltd | 生体用材料およびその表面処理方法 |
JPH09262280A (ja) * | 1996-03-28 | 1997-10-07 | Nippon Electric Glass Co Ltd | 生体活性インプラント材及びその製造方法 |
JPH09262281A (ja) * | 1996-03-28 | 1997-10-07 | Nippon Electric Glass Co Ltd | 生体活性インプラント材及びその製造方法 |
US5730598A (en) * | 1997-03-07 | 1998-03-24 | Sulzer Calcitek Inc. | Prosthetic implants coated with hydroxylapatite and process for treating prosthetic implants plasma-sprayed with hydroxylapatite |
DE19744809C1 (de) | 1997-10-02 | 1999-07-01 | Georg Dr Berger | Poröser, glasig-kristalliner Formkörper mit schneller Löslichkeit, Verfahren zu seiner Herstellung und Verwendung |
FI19991852A (fi) * | 1999-09-01 | 2001-03-01 | Yli Urpo Antti | Uusi monikerroksinen materiaali, joka käsittää vaikuttavan ainesosan, ja sen valmistus |
EP1225927B1 (de) * | 1999-11-02 | 2003-08-06 | Matsushita Electric Works, Ltd. | Reparaturmaterial für hartes gewebe |
-
1998
- 1998-12-18 DE DE19858501A patent/DE19858501A1/de not_active Ceased
-
1999
- 1999-12-17 AT AT99965491T patent/ATE221790T1/de active
- 1999-12-17 KR KR1020017007702A patent/KR100667619B1/ko not_active IP Right Cessation
- 1999-12-17 AU AU20986/00A patent/AU757451B2/en not_active Ceased
- 1999-12-17 DK DK99965491T patent/DK1140237T3/da active
- 1999-12-17 WO PCT/EP1999/010091 patent/WO2000037121A1/de active IP Right Grant
- 1999-12-17 JP JP2000589231A patent/JP2002532202A/ja active Pending
- 1999-12-17 PT PT99965491T patent/PT1140237E/pt unknown
- 1999-12-17 ES ES99965491T patent/ES2178499T3/es not_active Expired - Lifetime
- 1999-12-17 CA CA002355593A patent/CA2355593C/en not_active Expired - Fee Related
- 1999-12-17 EP EP99965491A patent/EP1140237B1/de not_active Expired - Lifetime
- 1999-12-17 US US09/857,972 patent/US6818332B1/en not_active Expired - Fee Related
- 1999-12-17 DE DE59902305T patent/DE59902305D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US6818332B1 (en) | 2004-11-16 |
WO2000037121A1 (de) | 2000-06-29 |
PT1140237E (pt) | 2002-12-31 |
KR100667619B1 (ko) | 2007-01-11 |
DE59902305D1 (de) | 2002-09-12 |
AU2098600A (en) | 2000-07-12 |
DE19858501A1 (de) | 2000-06-21 |
ES2178499T3 (es) | 2002-12-16 |
CA2355593C (en) | 2008-02-26 |
AU757451B2 (en) | 2003-02-20 |
DK1140237T3 (da) | 2002-09-09 |
JP2002532202A (ja) | 2002-10-02 |
ATE221790T1 (de) | 2002-08-15 |
EP1140237A1 (de) | 2001-10-10 |
KR20010099828A (ko) | 2001-11-09 |
CA2355593A1 (en) | 2000-06-29 |
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